Well you know that incredible dome the fort has, and at the top it had the light and some grass and trees and stuff there making you think it's somewhere in moutain behind the fort, well right above where the dome should be there is a large tower, I noticed this when exploring the roof, kind of annoyed me tbh, it's pretty lazy work lol

Yeah and the Volkihar castle has some bugs like that too. The undercroft area is larger than the island.